Astronomy and Astrophysics – Astrophysics
Scientific paper
2005-10-27
Phys.Rev.Lett.95:261301,2005
Astronomy and Astrophysics
Astrophysics
4 pages, 3 figures. Final version, with minor changes to match the version in print in Phys. Rev. Lett
Scientific paper
10.1103/PhysRevLett.95.261301
We have detected the four 18cm OH lines from the $z \sim 0.765$ gravitational lens toward PMN J0134-0931. The 1612 and 1720 MHz lines are in conjugate absorption and emission, providing a laboratory to test the evolution of fundamental constants over a large lookback time. We compare the HI and OH main line absorption redshifts of the different components in the $z \sim 0.765$ absorber and the $z \sim 0.685$ lens toward B0218+357 to place stringent constraints on changes in $F \equiv g_p [\alpha^2/\mu]^{1.57}$. We obtain $[\Delta F/F] = (0.44 \pm 0.36^{\rm stat} \pm 1.0^{\rm syst}) \times 10^{-5}$, consistent with no evolution over the redshift range $0 < z < 0.7$. The measurements have a $2 \sigma$ sensitivity of $[\Delta \alpha/\alpha] < 6.7 \times 10^{-6}$ or $[\Delta \mu/\mu] < 1.4 \times 10^{-5}$ to fractional changes in $\alpha$ and $\mu$ over a period of $\sim 6.5$ Gyr, half the age of the Universe. These are among the most sensitive current constraints on changes in $\mu$.
Briggs Frank H.
Carilli Chris L.
Combes François
Kanekar Nissim
Langston Glen I.
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